200 COMPOSITE. 



the whole completely enfolding its obcompressed achene. Eays 8 — 20; 

 their achenes obovate-oblong or narrower, without pappus. Disk- 

 flowers with cylindraceous-funnelform 5-lobed corollas; their achenes 

 linear-cuneiform, usually with a pappus of bristles or awns. Eeceptacle 

 flat, bearing a series of chaffy bracts between ray- and disk -flowers, 

 these, with the involucral bracts, mostly deciduous when mature, leaving 

 a naked receptacle. 



* Pappus of 10 — 20 bristles which are stout, and, below the middle, 

 long-plumose. 



4— Hairs of pappus-bristles not interlaced. 



1. B. heterotrichus (DC), Greene. Erect, 1 ft. high or more branch- 

 ing from the base, rough-hirsute or hispid and glandular: lower leaves 

 lanceolate: laciniate-pinnatifid or incised, the upper entire: rays large, 

 white: long- villous hairs of the pappus-bristles all erect and straight. — 

 Eastern base of the Mt. Diablo Eange, on sandy plains. April, May. 



2. B. graveolens, Greene. Stout, erect, 2 ft. high or more, sparingly 

 branching, hirsute, and with numerous rigid gland-tipped hairs inter- 

 spersed: leaves all entire: heads .very large, rays of a creamy white: 

 achenes slenderly clavate; pappus when mature deciduous in a ring, the 

 villous wool of the bristles all straight and erect and two-thirds their 

 length. — Said to occur on Mt. Tamalpais; but this may be doubted. It 

 may be looked for on the plains of the lower San Joaquin. Apr. — June. 



3. B. carnosns (Nutt.), Greene. Dwarf, depressed, branched from 

 the base, pubescent; leaves succulent, 1 in. long, linear-oblong or spatulate, 

 entire, or the lowest sinuate-pinnatifid: heads small: rays white, reduced 

 and inconspicuous: pappus-bristles sparsely plumose with straight 

 villous hairs. — Sands of the' sea beaches in Marin Co., etc. April — June. 



4 B. hieracioides (DC), Greene. Erect, rather strict, 2—3 ft. high, 

 stoutish, hispid: leaves linear to oblong, laciniate-dentate: rays yellow, 

 short, little exceeding the disk: hairs of the pappus all straight and 

 erect. Var. anomala, Bioletti. Involucral bracts open-boat-shaped, 

 not enfolding the achenes, and persistent on the receptacle after the 

 falling of the fruit. — A cparse weedy species of wooded or bushy hills, 

 in half shady places. May, June. 



5. B. gaillardioides (H. & A.), Greene. Freely branching below, 

 1 ft. high or more, hispid: leaves commonly laciniate-pinnatifid: rays 

 orange-yellow, %—% in. long: pappus dull- white or sordid, the bristles 

 about twice as long as their copious straight villous basal hairs.— Said 

 to be common near San Francisco; which we doubt. 



6. B. neuiorosus. Rather slender, sparingly branched above, 1 — 2 

 ft. high, hispidulous : foliage and heads much as in the preceding, but 



